R. Palanisamy ¹, K. Vijayakumar ¹, K. Selvakumar ¹, D. Karthikeyan ¹, G. Santhoshkumar ¹

Affiliations
1 Department of EEE, SRM University, Chennai – 603203, Tamil Nadu, IN

Abstract

Objectives: This paper illuminatessimulation and modelling of 5-level single phase Z-source based cascaded scheme inverter and its progress for output voltage twice the applied input voltage. Methods/Analysis: Z-source network utilizes a unique impedence network (L-C) combinations to connect with 5-level cascaded inverter, which gives unique features that cannot be obtained from the conventional inverter citcuits. Z-source network trounce the various restrictions of conventional voltage source inverter and current source inverters like reduced losses, voltage stress, improved output voltage. By using the shoot-through conditions the duty ratio of the proposed system can be speckled to achieve better output source voltage compare to conventional methods. This method is imitation using matlab - simulink with experimental results are verified using dsPIC controller. Findings: Z-source cascaded type H-bridge inverter facilitates to boost functional source voltage without any conservative dc - dc boost converters. The output source voltage of the planned system increased twice that of conventional inverter system and better current control is achieved.SPWM technique used to contorl the power switches placed in the proposed system. Novelty/ Improvement: The total harmonic level in the proposed system diminished and voltage stress in the each power switches also reduced. The method keeps away from the convention of dc/dc converter, diminishes the expenditure of the scheme and reduces voltage stress in the switches.

Keywords

Cascaded Type H-Bridge Inverter (CHBI), Matlab/simulink, Sinusoidal based Pulse Width Modulation (SPWM), Z-source Network.

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R. Palanisamy ¹, K. Vijayakumar ¹, K. Selvakumar ¹, D. Karthikeyan ¹, G. Santhoshkumar ¹

Affiliations
1 Department of EEE, SRM University, Chennai - 603203, Tamil Nadu, IN

Abstract

Objectives: The implementation of five phase three level Neutral Point Clamped (NPC) inverter is illustrated using space vector modulation technique based on the optimized five vectors switching strategy. Methods/Analysis: In 5 phases 3 levels NPC inverter consists of 243 switching state vectors, which can be reduced to 113 states by optimized Space Vector Modulation (SVM) switching strategy. The system has 11 sectors, which is converted into 6 sectors in that sub regions can be identified by optimised technique in d-q voltage vector. Simulation results of the five phase three level neutral point clamped inverter using SVM verified using Matlab/Simulink. Findings: SVM utilities switching states among the available various redundant states to reduce the common mode voltage and capacitor balancing problem. Dwell time calculations for this proposed does not need of any lockup table and park transformation. It’s applicable for high power medium voltage, remote sensing and industrial applications. Novelty/Improvement: The 3level 5phase NPC inverter has improved power density of the machine, enhanced dissection of power source among the inverter legs, abridged amplitude and augmented frequency of the torque pulsation than the traditional inverters.

Keywords

Neutral Point Clamped Inverter (NPCI), Optimised Space Vector Modulation (OSVM), Pulse Width Modulation Method (PWM), Switching States.

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Manimaran ¹, D. Karthikeyan ¹, P. T. Ravichandran ¹, Joga Jaya Prakash Reddy ¹

Affiliations
1 Department of Civil Engineering, SRM University, Kattankulathur - 603203, Tamil Nadu, IN

Abstract

Background/Objectives: Soil stabilization is one of the methods used when the given site conditions does not have desirable strength characteristics to support structures, railways and roads. It is the process for improving the soil properties by methods of mechanical or chemical, to produce an soil material which has all the required engineering properties. Application of solid waste disposal (Industrial or Agro waste) for soil stabilization is a significant which serves various benefits to the environment. Methods/Statistical Analysis: In this study the properties of weak soil is improved with the addition of Rice Husk Ash (RHA) of varying percentages of 3, 6, 9 and 12%. The sample was compacted at maximum dry density with the addition of OMC. A series of laboratory experiment has been conducted on expansive soil blended with Rice Husk Ash in 3%, 6%, 9%, 12% and 15% by weight of dry soil. Findings: Unconfined compressive and CBR values of soil increased with the addition of rice husk ash. From the UCC test result, showing that the percentage increase in UCS is 242% and the decrease in swell value from 75 to 45 for the addition of 12% RHA. The study giving the most relevant results by addition of Rice Husk Ash (RHA) upto12% in soil sample. Variations in mineralogical composition analysed by SEM and XRD studies clearly indicate the variation in soil structure formation, due to the chemical reactions initiated by the agro waste mixed in soil. Application/ Improvement: The Rice Husk Ash has a potential to improve the strength characteristics of expansive soil and it reduces the swelling potential of soil. Use of RHA in soil stabilisation is economic; eco friendly and it also solve the disposal problem.

Keywords

Agro Waste, Free Swell, Rice Husk Ash , UCS

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